'I am a few min late but YOU @rumerwillis my sweet first born came on your due date ready for action and have been in the drivers seat ready for this journey from the day you were born!' the 56-year-old mother-of-three - who boasts 7.3M followers - gushed on Instagram.

'Happy Birthday Baby Ru! Before you I didn't really know what love was! You continue to light the pathway of loving and I am honored to be on this ride with you my angel! Thank you for being a beautiful teacher and a magnificent being. I love you beyond measure!'

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The Masked Singer contestant's youngest sister Tallulah shared a bikini snap from the scene of her poolside house party.

'My strength, my valor, my tenderest hearted mama Rue, you walk into today a year older, with every single one of us in your corner,' the eccentric 25-year-old artist wrote on Instagram Friday.

The 56-year-old mother-of-three gushed on Instagram: 'Happy Birthday Baby Ru! Before you I didn't really know what love was! You continue to light the pathway of loving'

She added: 'And I am honored to be on this ride with you my angel! Thank you for being a beautiful teacher and a magnificent being. I love you beyond measure!'

Rumer replied in the comments: 'I love you so much mama, honored to be yours!'

'I am honored to have been chosen to walk this earth beside you, to learn from and with you, to share near-pants-peeing laughter, and bottomless movie marathon sprints. You always win, but I can try to keep up.

'You are radiating from a place of unbelievable emotional intelligence and with your actions show the rest of us a way to be that comes from solely a loving place. You are you and that is exactly perfect. You are the sexiest 31 year old this world has ever seen. Clear eyes, full hearts, cannot ever lose.'

Rumer's younger sister Scout also shared childhood snaps of her siblings, calling her a 'flourishing queen.'

Her father Bruce Willis (L) is not on social media, but his second wife Emma Heming Insta-storied: 'Happy birthday to the leader of the Willis sister pack! Love you sweet girl!'

Time to party! The Masked Singer contestant's youngest sister Tallulah shared a bikini snap from the scene of her poolside house party

The eccentric 25-year-old artist wrote on Instagram: 'I am honored to have been chosen to walk this earth beside you, to learn from and with you, to share near-pants-peeing laughter, and bottomless movie marathon sprints. You always win, but I can try to keep up'

'You are growing into your final Pokémon form, and damn it's sexy, it's intelligent, it's caring, it's mature, it lets me briefly yell at it to express my anger all the while knowing it has nothing to do with her,' the 28-year-old singer-guitarist wrote.

'You are the most generous human being I know, you give all of yourself to those you love and all you ask in return is for me to sleep over at your house bi-weekly and sog our with you. Spending time with you is in turns deeply growth provoking and the best vacation of all time.

'You are who I turn to in times of deep need, you offer me protection and love without any judgement! I am so excited to see how you bloom this year! I acknowledge and witness the woman you are while still holding the 7 year old who looks like a hot skate kid in slide 1 close to my heart. I love you forever and ever, you are my best friend, happy birthday!'

'You are who I turn to in times of deep need': Rumer's younger sister Scout also shared childhood snaps of her siblings, calling her a 'flourishing queen'

'Let's try to recreate this one?' The DWTS Mirrorball 20 champ also received birthday tidings from Ruby Rose and Annie Starke (L), who shared an epic snap of the pair with their famous mothers, Demi (R) and Glenn Close (2-L)

The DWTS Mirrorball 20 champ also received birthday tidings from Ruby Rose and Annie Starke, who Insta-storied an epic snap of the pair with their famous mothers, Demi and Glenn Close.

Rumer last made headlines Thursday complaining about how sick she's been this month with an 'unknown stomach problem' and 'flu that turned into a sinus infection.'

The USC drop-out has a blink-and-you-missed-it cameo as Joanna Pettet in Quentin Tarantino's Once Upon a Time in Hollywood, which has amassed $114.8M at the box office.

Feeling sorry for herself: Rumer last made headlines Thursday complaining about how sick she's been with an 'unknown stomach problem' and 'flu that turned into a sinus infection'

Amassed $114.8M at the box office! The USC drop-out has a blink-and-you-missed-it cameo as Joanna Pettet in Quentin Tarantino's Once Upon a Time in Hollywood